Metalworking machine



Sept. 15, 1936. "R. 5. BROWN ET AL 2,054,358

' QMETALWORKING MACHINE Filed July 1, 19.31 l3 Sheets-Sheet l- ATTORNEYSSept."15, 1936. R.S. BROWN ET AL 2,054,358

- METALWORKING MACHINE Filed July 1, 1931 13 Sheets-Sheet 2 HIIIIII miniP 1936- i R. 5. BROWN ET AL 5 2,054,358

METALWORK ING MACHINE Filed July 1, 1951 15 Sheets-Sheet 5 INVENTOR. 37"

.. ATTORNEYS.

Sept. 15 1936. I R. 5. BROWN ET AL. 1 8" METALWORKING MACHINE I FiledJuly 1, 1951 13 Sheets-SheetA 4 -ATTORNEYS.

P 5, 1936- R'S. BROWN ET AL 2,054,358

p 1936- R. 5. BROWN ET AL METALWORKI N G MACHINE Filed July 1, 1951 13Sheet-Sheet 6 Sept. 15, 1936. R. s. BROWN ET AL METALWORKING MACHINE l3Sheets-Sheet 7 Filed July 1, 1951 Z ESM) X06Fff3r I. ENTORS Wzzzmm an???'oRNEY5.

Se t, 15, 1936.

R. S. BROWN ET AL METALWORKING MACHINE Filed July 1, 1931 15Sheets-Sheet 8 ATTORNEYS.

Sept? 1936- I R. 5. BROWN ET AL 2,054,358

METALWORK ING MACHINE Filed July 1, 1931 15 Sheets-Sheet 10 1 I a ATTO RN F Sept. 15, 1936. R. 5. BROWN ET AL METALWORKING MACHINE Filed July 1,1931 13 Sheets-Sheet ll KM??? MRINVENTORS Wzzmm fi letz ATTORNEYS.

R. 5. BROWN ET AL 2,054,35

METALWORKING MACHINE Filed July 1, 1931 Sept. 15, 1936.

[NVENTORS TI'ORNEYSL Patented Sept. 15, 1936 nairso stares rrsar FriesMETALWORKING MACHINE Robert S. Brown, New Britain, and William B. Retz,Plainville, Conn, assignors to The New Britain-Gridley Machine Company,New Britain, Conn, a corporation of Connecticut Application July 1,1931, Serial No. 548,098 23 Claims. (Cl. 29-38) Our invention relates toa metal working maassociated with the turret in a novel manner.- chineand will be described as embodied in a mul- Extending from the turret isa tool slide guide tiple spindle automatic chucking machine of the uponwhich a tool slide is movably mounted. The Work rotating type. toolslide may be actuated by a draw rod extend- It is the general object ofthe invention toproing through the turret, and the drive for thespinvide a machine of the character indicated having dles is preferablyconcentrically arranged relaimproved structural and functional features,tively to the draw rod, and the parts are so rewith a view to producinga high production malated as to save space and provide a compact chine,which is sturdy, havin a high degree of machine. The tool slide may beadjusted on the flexibility and safety in operation. draw rod with easeand nicety by means of an 10 It is a more specific object to providenovel improved adjustment which is provided. The means for rigidlyholding a turret or spindle carchuck actuating devices may be veryreadily asrier. sembled and disassembled from the end of the Anotherobject is to provide a simplified form machine, and there is a safetydevice to prevent of spindle drive combined with a tool slide feedaccidental throwing in of the feed works while means rendering theentire arrangement very parts are in position for assembly anddisassemcompact. bly. 'In connection with the form of chucking It isanother object to provide a machine havmechanism herein disclosed, weprovide a safety ing means to simplify assembly and disassembly deviceto p v ury to h chuck p n an f the chucking mechanism and safetymechaabnormal movement of a chucking'rod which 20 nism for theprotection of an operator. is employed in the preferred form. The chuck-A still further object is to provide a safety ing is preferablyautomatically acccmplishedby device in connection with the chuckingmechacam means.

nism to avoid injury to the parts during opera- A magazine feedarrangement for automatition. 7 cally feeding work-pieces is so arrangedas to pick 25 Another object is to provide a novel and safe up a roughwork-piece from the magazine and form of hand cranking mechanism. tosimultaneously remove a finished work-piece A further object ofimportance is to provide from a chuck in loading position. The transferan automatic work feed or magazine feed armember is then moved so as toplace the rough 3O rangement having various safety features so aswork-piece in the chuck and to simultaneously to avoid injury to partsof the machine and which move the finished work-piece to a stripper fromis rapid and accurate in operation. which the finished work piece isremoved to a It is another object to provide a mechanism suitablereceptacie. The simultaneous functions for automatically rendering thefeed works inopperformed by the transfer mechanism provides erative uponan abnormal functioning of parts for accomplishment Of all Of the Workfeeding 35 of the machine, and incidentally in connection functions insubstantiaily hair" of the tim retherewith, signal means for indicatingnormal quired by a transfer device which must perform as well asabnormal functioning. the functions above noted successively ratherOther objects and features of the invention will than simultaneously.The magazine feed and either be pointed out or will become apparenttransfer arrangement is so arranged as to mini- 40 upon a reading of thespecification in connection mize the danger of injury to any of theparts upon with the drawings. any abnormai functioning. Improved meansBriefly stated, the machine selected for empreferably in the form ofelectrical contact means bcdiment of the invention includes a framehavhave been provided and arranged so that upon ing a spindle carrier orturret indexibly mountan abnormal functioning of the work feeding edthereon and carrying a plurality of spindles. means, the feed works willbe thrown out, where- Each spindle is provided with chucking mechaas,upon a normal functioning, the machine is nism, which, in the preferredform, is automath designed to operate automatically and the opcallyactuated at the loading station. The turerator need do nothing more thankeep the magaret is rigidly held against end movement by an zine filledwith rough work-pieces. A single op- 50 improved form of key or abutmentmechanism, erator may therefore take care of the requirepermitting freeindexing but serving to rigidly ments of several machines. Upon anabnormal hold the turret against end movement. The turfunctioning, wepreferably provide signal or tellret may be locked as usual by a lockingbolt and tale devices, such as a red light, toindicate a may be clampedby a suitable clamping band throwing out of the feed Works, and we may55 also provide a signal mechanism, such as a green light, to indicatethe normal and desired functioning of the machine.

In the drawings which show, for illustrative ,purposesonly, a preferredform of the invention embodied in a multiple spindle automatic chuckingmachine Fig. 1' is a view in front elevation of the lefthand portion'ofthe machine;

Fig. 2 is'a similar view of the middle portion of the machine and issubstantially a continuation of Fig. 1;

. Fig. 3 is a similar view of the right-hand portion of the machine andis substantially a con tinuation of Fig. 2;

Fig. 4 is a right-hand end view of the machine illustrated in Figs. 1,2, and 3, parts such as cross slides being omitted;

Fig. 5 is an enlarged sectional view through the spindle carrier orturret and illustrating improved means for holding the turret againstend movement and improved spindle carrier clamping means V Fig. 6 is afragmentary view from the rear of the machine of the spindle carrier andone spindle and chucking, devices, together with a developmentof thespindle drive gearing;

Fig.6 is a sectional view on an enlarged scale of the chuck shown inFig. 6;

Fig. 7 is a development View of a feed gearing and is substantially acontinuation of the bottom of the gearing shown in Fig. 6;

Fig. 8 is a fragmentary sectional view from the a rear of the machine ofa tool slide and tool slide guide and illustrating an improvedadjustment of the tool slide on its actuating rod;

Fig. 9 is an end view in elevation of a transfer mechanism and parts ofan endless chain'feed arrangement for work-pieces;

Figs. 10 and 10 are sectional views on an enlarged scale takensubstantially in the plane of the line |0l0 of Fig. 2 andillustratetransfer mechanism and means for moving the same, Fig;

10 being a continuation of Fig. 10

Figs. 11, 12, and 13 are side views in quarter section of differentforms of transfer chucks appropriate for certain classes of work;

Fig. 14 is an end view in elevation of the left- 7 hand end of themachine as shown in Fig. 1, parts being broken away to disclose interiorconstruction;

Fig. 15 is a view of parts shown in Fig. 14 but viewed at right anglesthereto, parts being broken away;

Fig. 16 is a sectional view of parts shown in Fig. 14; r

Fig. 17 is a diagrammatic view illustrating the application of certainsafety and signal means for the machine.

The general features of the machine,together with certain improvements,will first be described,

' and then the magazine feed mechanism, together with certain safetydevices, will be taken ,up.

The machine, in general, comprises a sturdy frame 5 having the maindriving motor 6 mounted thereon. The turret or spindle carrier 1 isindexibly mounted in a substantially semi-circular bearing trough 8,whereby an extensive and very substantial bearing is provided over aconsiderable length of the spindle carrier and over approximately halfof its circumference (Fig. 5). In order to very'sat'isfactorily resistend movement ofthe spindle carrier under tool pressures, we provide keyor abutment means intermediate the ends of the turret. As shown moreparticuendwise movement, and this without any outside r plates orflanges.

The turret may be indexed in any suitable manner, such as by means of aGeneva or a gear mechanism (not shown). The turret may be locked inindexed positions as by means of a looking bolt I2 (Fig. 2), which maybe spring pressed in the locking direction by means of a lever 13 andsprings I l-l4 and which may be positively withdrawn by means of the caml5.

In addition to the locking bolt [2, we preferably provide a clampingband or strap I6 which may lie in the upper portion of the'groove 9,though, as shown particularly in Fig. 6, it need not fill the groove.The clamping band 16 is preferably held at one end by an adjustable rod17, and a spring 18 may be provided for urging that end of the clampingband l6 upwardly. To the opposite end of the band IS, an actuating ordraw rod !9 is secured. A heavy spring 20 serves to urge the draw rod l9downwardly, and thus the clamping band 16 is moved into clampingposition. The clamping band I6 is positively moved to unclamp the turretas by means of a cam 2| and lever 22 engaging the lower end of the rod[9. Thus, the clamping band I6 is always moved into clamping position bya substantially uniform and predetermined force by means of the spring,2%, and wear of the parts will not substantially change the clampingforce. The clamping band is positively moved to its unclamped position.The upper or cap portion 23 of the frame serves as a cover for thespindle carrier and is preferably free thereof.

As heretofore indicated, the spindle carrier 1 is provided with aplurality of rotatable spindles 24-44, which may be mounted on preloadedball bearings 2525 (Fig. 6). Each spindle carries at its forward end achuck designated generally 26 and shown on an enlarged scale in Fig. 6As illustrated, each chuck comprises a. housing or body 21 having a camsurface or cam surfaces 28 upon which ride chuck jaws 2929. It will beseen that upon a rearward movement, that is, toward the right in Figs. 6and 6 of the jaws '29, the latter will be moved radially outwardly so asto grip a work-piece, such as the bearing ring 30, or other work-piecehaving a bore therein. In order to move the jaws 29 rearwardly to thegripping position, a stud 3| having a head 32 engages the jaws and isslidably mounted in the body 21. The stud 3| is preferably moved in thechucking direction by means of a draw rod 33 and heavy spring 34 asshown herein, but which chucking arrangement, by means of draw rod andspring and actuating means therefor, are claimed broadly in Brownapplication, Serial No. 276,590, filed May 10, 1928, now Patent1,887,621, November 15, 1932.

In order to move the draw rod 33 against the heavy chucking spring 3 3there is provided a yoke device 35 to engage the rear of the spindle or,more properly, an anti-friction device carried thereby, and the yoke 35carries a push rod 36 in the form of a rack engaged by a pinion 31 onshaft 38 mounted in the frame. The shaft 33 is rotated (Fig. 1) by meansof an external lever 39 and link 49 on an actuating slide 4!, which maybe actuated by a cam and lever arrangement 42-43, as shown. Thus, uponmovement of the slide H in one direction the pinion 3'! will move thepush rod 36 toward the left as viewed in Fig. 6, so as to compress aspring 34 and move the stud 3i through the instrumentality of a spring44 which is interposed between the outside of a recessed head 45 and aflange 46 on the stud 3|. In the interior of the recessed head 45 is anabutment head 41, which is secured as by means of a screw connection 48to the stud 3!. It will be seen that when the push rod 36 is released,as by movement of the slide M, in the direction opposite to that lastnoted, the draw rod 33 will be forced rearwardly by the spring 34, andthe shouldered head All, being in engagement with the shoulder of therecessed head 95, will draw the stud 33 rearwardly so as to force thechuck jaws 39 outwardly into gripping position. Now, upon movement ofthe draw rod 33 toward the left, the recessed head 45 and spring 51%will force the stud 3! toward the left, to release the chuck jaws 29.Should the draw rod 33 be given more movement than is required forreleasing the jaws 29, the head 47 may simply move rearwardly in therecessed head and no damage to any of the parts of the chuck willresult. In other words, the head All and recessed head 45 constitute alost motion connection operable in one direction, so that the requiredmovement of the draw rod 33 need not be so very accuratelypredetermined, and yet the jaws may be properly actuated.

In the form shown the spindle carrier 1 has centrally secured thereon asubstantial tool slide stem 59, which may have a tapered fit thereon(Fig. 6) and be secured, as by means of a nut 55, threaded onto the rearend of the stem and engageable with a shoulder on the spindle carrier.The opposite end of the tool slide guide 59, as shown in Figs. 3, and 8,is rotatably carried in a bearing 52 in the pedestal 53 on the frame ofthe machine. The tool slide 54 is slidable on the tool slide guide 59and carries suitable tools, as will be understood. The tool slide 56. isguided and held against rotation during its feeding and return movementsby means of a rigid arm 55, fitting in a longitudinal guideway 56 on theframe. The tool slide 5 3 is moved on its guide stem by means of a drawrod 51, adjustably secured at one end to the tool slide or an extension58 thereof. The draw rod 51 extends through the guide 59, which issuitably bored for that purpose and extends to the lefthand end of themachine, where it is provided with a suitable cam follower 59, to beactuated on a cam on the main feed cam drum 69, as will be understood.

We have provided novel means for accurately adjusting the tool slide 54on the draw rod 5'! and for securing the same in adjusted position. Inthe form shown the tool slide 54 or, rather, the tail extension 53thereof, is bored and counterbored to receive nuts 9l62 to engageopposite sides thereof. These nuts $l52 are both threaded onto the endof the draw rod 51. Each of the nuts is provided with devices, such asgear teeth 33, and the tail extension 58 is longitudinally bored, asindicated at 64, so that a wrench in the form of a pinion may be passedthereinto. By means of such a pinion wrench either or both of the nutsmay be engaged. With one of the nuts loosened up, both of the nuts maybe rotated simultaneously so as to adjust the tool slide and draw rod 5?relatively to each other. When the proper adjustment has been made oneof the nuts may then be turned up so as to very securely hold the drawrod to the tool slide. One of the nuts in effect serves as a lock nutfor the other, and both nuts serve to effect adjustment.

A part of the spindle drive arrangement is of novel form and is sorelated to the tool slide draw rod iii as to provide a compact and.convenient arrangement. Fig. 6 shows more particularly the spindle driveworks. A chain from the driving motor 6 (Fig. 1) serves to drive thesprocket (Fig. 6) secured to the main drive shaft The small gears 5'!may be noted in passing as drive gears for a pump or pumps. The maindrive shaft 63 passes to the left and secured thereon is a pick off gear68 meshing with a second pick off gear 63 on a stub shaft. Pick oif gear59 is keyed to the gear l9 which in turn drives the gear ll secured tothe drive pinion 82, which in turn drives the gear 13. Gear 'ii andpinion l2 may be fixedly mounted on a sleeve surrounding shaft 66 andfree to rotate relatively thereto. By means of the pick off gears i5859,any desirable spindle speeds may be secured.

In order to secure a concentric compact drive for all of the spindles,we provide a drive sleeve M which may be mounted on an anti-frictionbearing '75 in the spindle carrier 1. A rear portion of the sleeve maybe mounted on an antifriction bearing V6 in the frame web ii. The drivesleeve carries a gear l8 meshed with and driven by the gear l3 which isdriven by the pinion if. The forward end of the sleeve 14 carriesanother gear l9 which is concentric with the spindle carrier and mesheswith each of the spindle drive gears 88. Each spindle drive gear may beclutched and unclutched as by means of a clutch 8! from the spindleitself, and, if desired, a suitable brake may be engaged with a brakespool 82. In a chucking machine, each spindle when it reaches theloading position is normally unclutched from its drive so that the chuckmay be loaded. The present concentric drive, however, may be employed ina screw machine. The novel driving arrangement including the drivesleeve M permits the passage of the draw rod 51 and may even act as aguide or support therefor if desired. The feed gear train is as follows:

During the normal feeding of the tools, the cam drive is from the drivepinion 12 (Fig. 6) to the drive gear 83 (Figs. 6 and '7). The drive gear33 is rigidly connected by means of a sleeve to the gear 84 which mesheswith a gear 85 keyed for rotation with a pick off gear 86. The gear 86meshes with a second pick oif gear 8i which drives one portion of anoverrunning clutch 88, which in turn drives the gear 89 through theshaft 99. The gear 89 meshes with and drives the gear 9| carried by apart of the main feed clutch designated generally 92. When the main feedclutch is in as indicated in Fig. 7, the sleeve 93 and pinion at arerotated and the latter meshes with the gear 95 which in turn drivesgear95. Gear 96, through the two gears el -98 and gear 93, drives the mainfeed cam '69. The above described drive is for the slow traverse orworking portion of the cam rotation.

An accelerated drive is provided for driving the cam shaft .at a higherrate of speed .during the drawback,.jump of the tools, indexing, spindlecarrier locking, etc. The accelerated drive is from the main drivesprocket 65 and drive gear IE9 (Fig. 6), which latter drives the gear'ItI on the accelerated shaft 662 (Fig.7). The gear IOI .drives througha clutch I 03, which in turn drives the shaft 90 and drive gear 89. Thegear 89, by means of the gears 9!, clutch 92 and gears 94 to 99heretofore described, drives the main feed cam 66 at a rapid rate. Thisaccelerated drive is permitted without unclutching the other gearsheretofore described, because of the overrunning clutch 88, whichpermits the slow traverse gears to be driven in the usual manner andmerely permits thejgear 89 to run ahead of the normal drive of the slowtraverse train. When the clutch I03 is out, the'drive to the main feedcam 60 is through the slow traverse, and when the clutch N33 is in, thedrive is through the accelerated gears or fast traverse. When the clutch92 is out, it will be clear that there can be no drive to the main feedcam. As is usual in machines of this type, the clutch I33 is controlledby suitable dogs (not shown) on the main cam or some part coordinatedtherewith.

The main feed clutch 92 may be. actuated manually by a handle I04 at thefront of the nected by a link I08 to the clutch shaft lever I 09, sothat upon movement of either manual handle and consequent rotation ofthe shaft I06, the clutch 92 will be moved 'to either the .in or the outposition, as will be understood.

In connection with the main cam drive, we have provided a hand crankingmechanism (Fig. 7) constituting an improved safetymechanism to renderthe hand cranking mechanism inoperative when the main feed clutch is inand which may automatically render the hand cranking mechanism.operative when the main feed clutch is thrown out. In the form shown,the gear 98, which drives the feed cam gear 99, is carried upon a pinionsleeve shaft H0, and a rod III is splined to the shaft as by means ofthe teeth or splines H2. One end of the rod III is connected to theclutch shaft lever m9 so that when the latter is moved to throw theclutch in either direction, the rod I I I will be moved longitudinallyand will always be splined to the cam driving sleeve shaft I I6. Thereis a short sleeve or bushing I I3 mounted in the frame and which isprovided with teeth or parts II4 for .coaction with the spline parts H2on the rod III. A shaft H5 is rotatable with the bushing H3, and, asillustrated, we have provided the shaft H5 with splines or teeth I I5which mesh with the complementary parts i I4 in the bushing I I3. A handcrank I I1 is connected to the shaftI I5 as by means of bevel gears H3;It will be clear that with the main feed clutch 92 inthe in position asshown in Fig. '7, the rod III is positioned at the righthand limit ofits movement; and the splines or teeth I I2 are withdrawn from thesleeve or bushing II3. However, when the clutch shift lever I09 isrotated so as to throw the clutch 92 out, the rod I I I is moved to theleft so that the teeth I I2! I4 mesh with each other, and upon rotationof the hand crank I H, the rod I I I, and through it hand crankingmechanism while the power feed is on, and by the mere act of throwingout the power feed by means of the main feed clutch 92 the hand crankingmechanism becomes operative. There are other safety devices inconnection with the main power feed clutch to prevent ertures arenormally covered by a shiftable cover or annular plate I25 rotatablyheld to the frame as by means of a central disk I20 secured by screwsI28.

apertures H9 to I24 when the cover plate is shiftedto one position, andwhenshifted to another position, the cover plate serves to cover thoseapertures. .As illustrated, the closure plate I25 has'a large open notchI 26 to register with the large apertures I24 in the frame, and isprovided with smaller apertures I2'II29I3Il.

The closure plate may be further provided with.

an extended open notch I3I which permits access tothe aperture I2! whenshifted to one position. The notch I3I further permits the location ofother parts on the frame, as will be later described. 7

Thus it will be seen that with the closure I25 in the position indicatedin Figs. 6, 14 and 15, all of the frame apertures are covered. Withthecover plate shifted clockwise, as viewed in Fig. 14, it will be seenthat all of the frame apertures will be uncovered so as to permit accessto the chuck actuating mechanisms. The various drive gears which may bein the wayof a tool inserted through any of the frame apertures arepreferably provided with spaced apart spokes, so as to readily admit abaror other tool, as will be understood. The large aperture I24 is ofsufficient size to permit removal or insertion of the chucking spring 34and actuating rod 33 and other assembled parts.

The frame and cover plate I25 may further be provided with registeringapertures which are in registry with each other when the remainingopenings in the frame and closure plate are out of registry and theframe openings therefore closed. Passing through the opening I32 is arod I34 (Figs. 6, 14), which may be spring pressed inwardly by means ofa spring I35. The rod I34 extends within the frame and is located in thepath of a crank arm I36, carried by the shaft E36, which is oscillatedfor moving the main feed clutch 92. Thus, when the closure plate I 25 ismoved so as to uncover the frame openings II9 to I24, the openings I32and I33 will be out of registry, and, by reason of the crank 53% and rodI34, it will be impossible to oscillate the shaft I96 and the main feedclutch 92 cannot be thrown in. By the means just described it will beclear that any tool inserted through the frame openings will have to bewithdrawn and the cover plate I25 shifted so as to close all the frameopenings before the main feed clutch can be thrown in. The rod I34, aswill be later described in connection with certain electrical devices.is made use of for closing a normally open 7 The cover or closure plateI25 is' 20 provided with means registering with the various switch whenthe clutch is thrown out, so as to energize a signal device.

M agaeine feed We have devised an improved and very rapid method ofautomatically feeding work-pieces to the chucks and removing the sametherefrom. We have also devised certain safeguards and telltale devicesto prevent injury to the machine and to provide a check on itsoperation.

We may employ a magazine arrangement in the form of spaced plates l3ll3lcarried on an endless chain running over sprockets carried at the top ofthe frame. Beneath the lower run of the chain is a slideway which, inthe form shown, consists of a pair of bars l38l39 so that work-piecessuch as bearing rings, for exampie, M9 may be placed by the operatorbetween adjacent spaced plates iii-Hi and may rest on the two rods138-439 and be slid therealong during movement of the chain. As will belater described, the chain is given a step by step movement so as todischarge a work-piece Mil at the proper time. As shown best in Figs. 4and 9, the work-pieces, shown as bearing rings, are moved along theguide rods l38l39, and when a work-piece reaches the proper location itmoves down by gravity to the position indicated in Fig. 4. In order topermit this action, the guide rod 539 terminates just before the pointat which it is desired to discharge a ring into a suitable holdingdevice, and therefore when the ring passes beyond the end of the rodI39, it simply rolls or slides out from between its holding plates l3!and moves down the adjustable guide track l4! and into engagement with asecond adjustable guide or stop Hi2 where it reposes as is indicatedparticularly in Fig. l. The guides l4l--|42 are so positioned as toquite accurately locate the ring in any desired position to be picked upby a transfer device to be described.

In our preferred form, the transfer device is designed to pick up arough work-piece from the holding device is l--M2, and at the same timepick out a finished work-piece from the chuck 26 in loading position andthen transfer the rough work-piece to the chuck 26 in loading positionand at the same time transfer the finished work-piece from the chuck 26to a stripping device and thereafter move away to permit indexing of thespindle carrier. In the form illustrated, our transfer device includestwo transfer chucks its-4M carried by a transfer arm device M5 on arotatable and longitudinally slidable shaft i le mounted in the frame.

Figs. 11, 12, and 13 iilustrate different forms of transfer chucks whichmay be employed. In the form shown in Fig. 11, external gripping jawsldll4l are provided and are moved in the gripping direction by means ofa spring i485 and draw rod M9. The forward ends of the jaws may bebeveled as indicated at H56 so that by a mere longitudinal pressure onthe transfer chuck, the work-piece, such as the ring shown in Fig. 11,will expand the jaws and will be held between the jaws by the spring i58. Fig. 12 indicates a slightly different form of transfer chuck forinternal gripping and consists of a sleeve having apertures therein forball jaws l5l which are spring pressed outwardly by means of the conel52 and spring l53. Spring pressed plungers E54 may be provided forserving as a resilient backing for the work-piece. Fig. 13 shows stillanother form of internal gripping transfer chuck in which the jaws E55are pivoted somewhat like those shown in Fig. 11 and are provided withtapered ends I56 so as to be automatically moved inwardly by thework-piece and against the spring E51. Fig. 13 illustrates, in addition,a pair of stripping fingers, to be later described. It is to beunderstood that for various types of work, various appropriate types oftransfer chucks would be employed.

The transfer chucks on the transfer arm I45 are spaced apart a distanceequal to the distance between the chuck 25 in the loading station andthe work piece I40 (Fig. 4) the location of which for convenience weshall term the magazine, since the work positioning means is, in fact, apart of the magazine arrangement. The space between the transfer chucksHl3l44 is also equal to the distance between the chuck 26 in loadingstation and the stripping device, designated generally E58, and whichmay comprise a pair of spring pressed stripping jaws led-461i (Figs. 2,9 and 13), having tapered noses l6 l-i6l to be engaged by the work pieceand having shoulders l62-l62 to engage behind the work piece so that,upon withdrawal of the transfer chuck, the work piece will be strippedand fall into a suitable hopper.

Movements of the transfer arm M5 and transfer chucks carried therebyconsist of a longitudinal movement inwardly to pick up a rough workpiece from the magazine and. at the same time pick up a finished workpiece from the chuck in loading position. Transfer chucks are next movedoutwardly and then rotatably, so as to bring the rough work pieceopposite the chuck in loading position and the finished work pieceopposite the stripping device. The transfer arm is then again movedlongitudinally inwardly so as to position the rough work piece in thechuck in loading position and the finished work piece in the stripper.The chuck is then closed automatically to grip the work piece thereinand the transfer chucks are then again moved longitudinally outwardly tostrip the finished work piece and leave the rough work piece in themachine chuck, after which the transfer device is again rotated upwardlyto the initial position. These movements are accomplished as follows:

As shown particularly in Figs. 2, 10 and 10 the transfer arm shaft I46is journaled and slidable in spaced apart frame bearings "53-464. Theshaft M5 is moved toward the right as viewed in the drawings by positivemeans, such as the lever Hi5, having a nose I66 to engage a plug orbutton it? secured in the end of the hollow shaft 46. A link IE8 ispivotally connected at one end of the lever I65, and at the opposite endto a bell crank lever I69, actuated in one direction by a cam E10 on thecam shaft. Thus, when the cam rocks the lever I69 so as to draw down onthe link I63, the nose I66 in engagement with the button lii'lpositively moves the shaft M6 to the right, that is, in the direction tomove the transfer chucks away from the magazine and machine chuck, whichmovement, as stated, removes a rough work piece from the magazine and afinished work piece from the machine chuck. After the shaft I45 has beenrotated by means to be described the shaft M6 is moved toward the left,so as to position the work pieces carried by the transfer chucks in themachine chuck and stripper. This left-hand movement is preferablyaccomplished by spring means, so as to avoid injury to parts in caseanything goes wrong with the machine.

In the form illustrated, a coil spring is located within the hollowshaft 36 and is sustained at one end by the button I61 and at the otherend by a plug I1 I having a pin therethrough forming gudgeons I12, heldin a ring I13 which may'abut a part 'of the frame, as shown particularlyin Fig. 10. Itwill be clear that when thecam I16 permits, the shaft I46will be resiliently moved to the so that upon movement of the rack barI16 the shaft I46 and parts carried thereby will be rotated. Agroove'cam I18 (Figs. 2 and' l) serves to reciprocate the rack bar l 16through a connecting rod I19, and springs I8ll-I9I preferably form partof the connecting means between the connecting rod I19 and the rack barI16, as clearly appears in Fig. 2 and as will be understood. Needless tosay, the cams E16 and 518 are of such form and are so located as torotate the transfer arm and to move the same longitudinally at theproper times and in the proper sequence.

The operation of the transfer mechanism is as follows: V Assuming thetransfer mechanism to be in the position indicated in Figs. 2 and 4, itwill be seen that the cam I18 has raised the connecting rod I19 andthrough the spring ISI has moved the rack bar I16 upwardly to rotate theshaft I46, so as to bring. one transfer chuck into alignment With thestripper mechanism I59 and the other transfer'chuck into alignment withthe machine chuck 26 in the loading station. The spring I14 in shaft I46has served to rock the lever I65 and raise the link I63 so as to permitthe shaft I46 and consequently the transfer chucks .to move toward theleft, that is, so as to convey the rough work-piece in the transferchuck I43 into the machine chuck 26 in loading station and to bring afinished work-piece from the machine chuck 26 into the stripper I59. Thespring connection between the rack bar I16 and the cam I18 has causedthe transfer arm to be resiliently moved, until a guide block I82 (Fig.9) contacted with the lower limit stop E93 'adjustably secured on themachine frame. As stated, the spacing of the transfer chucks on the armis such that when a the limit stop I83 is engaged by the block I82, thework-pieces in the transfer chucks will be properly aligned with themachine chuck and the stripper.

Now upon movement of the cam I16, the lever E69 will be rocked so as todraw the link I68 downwardly and cause the nose I66 of the upper crankto positively shift the shaft 1 46 and transfer chucks toward the'right,which movement serves 'to leave the finished work-piece in the stripperI 59 and leave a rough work-piece in the necting rod I12 and through thespring connec-' tion I89 the rack bar I16 is moved downwardly, so as torock the shaft 546 and the transfer arm I into the rotative positionshown in Fig, 9, which movement will bring the upper guide block I82into engagement with the upper limit stop I83 adjustably secured on theframe. The arm 445 is provided with a shorter guide block I84, whichshort guide block permits the transfer arm I45 to swing into theposition indicated in Fig. 9 7

when the shaft I46 is out the limit of its out movement. While the armI45 is thus held in the position shown in Fig. 9 by the cam I18 andresilient connection heretofore described, the spring I14 slides theshaft I46 inwardly .and resiliently moves the transfer chucks to the inposition shown in Fig. 2. During this movement the lever I65, link I68,and lever I69 are moved to the positions shown in Fig. 2.

With the parts in the positions of Fig. 2 the transfer chuck I 43 willpick up a rough work iece which has previously been dropped into themagazine positioning means Nil-I42 by means to be described, and thechuck I44 will at the same time pick up a finished work piece from themachine chuck 26 in loading position, which machine chuck is thenautomatically opened. During this in movement the transfer arm I45 isaccurately guided by the two upper guide blocks IB2-I 34, which will bein engagement with opposite sides of the limit stop E83, so as toaccurately guide the transfer arm. The cam I16, through a lever I69,link I68 and lever I65, will then positively move the shaft I46 andtransfer arm to the right, so as to carry a rough work piece in thetransfer chuck I43 and a finished work piece in the transfer chuck I44.During this longitudinal movement the short guide block I84 will passbeyond the end of the upper limit stop I83,

and thereafter the cam I18, through the means chuck and conducting thesame to a stripper, our

transfer mechanism in addition picks up a rough work piece and transfersthe same to'the chuck. Considerable time is thus saved.

By the use of two transfer chucks instead of one, We not only save timebut assure greater positiveness of action. One chuck which trans fersrough work pieces is of appropriate size and design to properly gripsurfaces on the rough work pieces, while the other chuck is ofappropriate size and design to properly grip finished or other surfaces,on the finished work pieces. Thus, with each chuck designed to performits single function, there will be greater certainty of action thanwhere one chuck must handle both rough and finished pieces.

The chain portion of the magazine feed mechanism is moved in proper timewith the transfer mechanism and is preferably moved by the same meansthat moves a part of, the transfer mechanism. In the form shown (Figs.2, 9) the shaft I85 of the inner sprocket for the chain is pro- 7 videdwith a ratchet wheel I66, to be engaged and rotated by a pawl I8? Thepawl is mounted upon a lever Hill, which connects to one end of a linkI39, the opposite end of which is connected to a bell crank lever whichin turn is connested by means of a link E9! to the rack bar I16heretofore described. In order to determine the picked up by the pawl 8?at each actuation thereof, we preferably provide a knock-off plate I92,which may be pivotally mounted on the shaft I and adjustably held as bymeans of a pin and slot connection 99's to the frame. The pawl i 8?! isprovided with a pin m l which, during actuation of the lever 388, ridesup on a cam surface I on the plate Hi2, and thus causes the nose of thepawl to be withdrawn from the ratchet teeth and to prevent engagement ofthe nose of the pawl with another ratchet tooth until, by reverseactuation of the lever I88, the pin I94 is disengaged from the camsurface I95. Thus, by shifting the plate 592 and holding the same inadjusted position by means of the pin and slot connection 593, the pawlmay be caused to pick up one, two, three or any desired number of teethat each actuation, so as to cause a new work piece to be dropped intothe magazine positioning arrangement t ll-I62 during each cycle. Themagazine chain is thus actuated by the rack bar H6, so that a new workpiece is dropped the magazine positioning arrangement i4 4-542 at thetime that the transfer arms are in their out position and duringrotation of the transfer arm in a downward direction, so that, when thetransfer arm is again moved to the upper position as shown in Fig. 9, anew work piece will have been previously deposited and will be ready tobe picked up by the transfer chuck M3.

The resilient in movement of the transfer arm by the coil spring ilprevents injury to the parts which might be occasioned were suchmovement positive and work-pieces or the like should jam in the chuck ormagazine device. The resillent actuating means Isa-use likewise preventsinjury to parts of the machine should there be any jamming action, andalso obviates the necessity for very accurate positioning or camming ofthe parts, since the transfer arm is moved up against limit stops. Thus,the same cams will take care of work pieces of different sizes anddifferent shapes and transfer chucks of difierent appropriate sizes,and, since the limit stops are adjustable, the transfer and magazinearrangements are exceedingly flexible.

In connection with the magazine loading device, we prefer to provideadditional safeguards and telltale devices for automatically stoppingthe machine as by throwing out the feed clutch and at the same timeproviding a signal to indicate that the feed clutch has been thrown outwhenever there is an abnormal action to the machine. We preferably alsoprovide signal means in the form of a light to indicate that the machineis operating normally. In the form shown, we provide means for throwingthe feed clutch in the event that the transfer chucks are prevented frommoving up to the magazine device and the machine chuck or stripper, orin the event that for any reason they do not move to the normal extent.We may likewise provide means for throwing out the feed clutch in casethe transfer chuck fails to pick up a work-piece, which failure might bedue to a failure of the operator to load the magazine or, to failure ofsome part of he machine preventing such pick Referring particularly tothe diagramma ic drawing of Fig. 17, and to Figs. 2, 9, l4, and 15, itwill be seen that we provide a solenoid 2% having a core piece so! whichperiodically during normal operation of the machine is energized andserves to prevent the feed clutch from being thrown out. However, uponan abnormal operation'of the machine, the solenoid 2GB is not energized,and the feed clutch is thrown out mechanically. The main feed cam 66, orany auxiliary cam synchronized therewith, is provided with one or morecam dogs 262, and in the path of these dogs is a cam roller 2&3 carriedby a lever arm 2%. The lever arm in the form shown is on a sleeve 2B5loosely mounted on the shaft Hi6 between a fixed collar 28% and a fixedhub till carrying a lever arm 2&3 which is ultimately connected to amanual handle at the front of the machine, as will be described. It willbe recalled that the shaft 536, as appears more clearly in Fig. 7,controls the position of the main feed clutch 92 so that uponoscillation of the shaft act that main feed clutch is thrown in or out.Splined to the sleeve 265 and slidable thereon is a sleeve or hub 299which has means such as a pin 2H! which is in the path of an ear 2! i onthe hub 281, which, as stated, is fixed to the shaft W6. A spring 2l2normally holds the pin in the positions shown in Figs. 15 and 16 so asto be in the path of the ear 2!! i. It will therefore be seen that withthe pin engaged behind the ear 2! l, as shown, when the cam roller 2% isengaged by a dog, such as 262, the arm 2% and with it the sleeve 285will be rocked in a clockwise direction as viewed in Fig. 15. Thisrocking will cause the pin behind the ear 2H to rock the hub 20'! andwith it the shaft IE6, which, as has been described, will throw out themain feed clutch and the feed functions of the machine will be stoppeduntil the clutch is again thrown in manually. As indicated in Fig. 15, acoil spring 2i3 serves to urge the lever 264 into the position shown soas to position the roller 203 in the path of the dogs such as 2&2, andeach time a dog passes the roller, the arm 2% is rocked.

Now, when all parts of the machine are functioning properly, it is notdesired to have the main feed clutch thrown out each time the lever 204is rocked by a dog 2%, and the solenoid core 2M is made use of forwithdrawing the pin 2H] from behind the ear 2H so that rocking of thelever 204 will be a mere idle rocking movement and will not throw outthe feed clutch. In the form shown, the sleeve or hub 2139 carrying thepin M5 is engaged by a fork on a lever 2M fixedly carried by a shaft 2 i5 mounted in the frame. Also fixedly carried by the shaft M5 is an arm2I6 which is connected by means of a link 2!! to the core 21H of thesolenoid. It will be clear that when the solenoid is energized to drawthe core 29! inwardly, the shaft 2E5 will be rocked soas to rock thefork Eli and withdraw the hub 269 and with it the pin out from behindthe ear 2| I so that a rocking of the arm 294 by the dog 202 will haveno effect on the feed clutch. As soon as the solenoid is de-energized,as will be later described, the spring 2 i2 again moves the hub 289 andpin 2 l0 into the positions shown in Figs. 15 and 16 so that they are inposition for clutch throwing.

The main feed clutch t2, in addition to being movable by means of themanual handle 35 at the rear of the machine, is movable by the handle [Mat the front of the machine through a link 218, rock lever 259, link2223 and arm 2&8 on the hub 29?. Thus, the main feed clutch may beactuated manually from either the front or rear of the machine and maybe automaticaliy actuated by means of the pin and ear device heretoforedescribed.

The electrical connections and devices for caus-

